<template>
<el-container class="home-container">

    <el-header>
        <div>
            <img src="../assets/tree.png" height="50px" width="50px" alt="" />
            <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">
            退出
        </el-button>
    </el-header>

    <el-container>
        <el-aside :width="isCollapse ? '64px' : '200px'">

            <div class="toggle-button" @click="toggleCollapse">|||</div>
            <el-menu background-color="#333744" text-color="#fff" active-text-color="#409fff" unique-opened :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">

                <!-- 一级菜单 -->
                <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
                    <!-- 一级菜单模板区域 -->
                    <template slot="title">
                        <!-- 图标 -->
                        <i :class="iconsObj[item.id]"></i>
                        <!-- 文本 -->
                        <span>{{ item.authName }}</span>
                    </template>
                    <!-- 二级菜单 -->

                    <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                        <template slot="title">
                            <!-- 图标 -->
                            <i class="el-icon-menu"></i>
                            <!-- 文本 -->
                            <span>{{ subItem.authName }}</span>
                        </template>
                    </el-menu-item>
                </el-submenu>
            </el-menu>
        </el-aside>
        <el-main>
            <!-- 路由占位符 -->
            <router-view></router-view>
        </el-main>
    </el-container>
</el-container>
</template>

<script>
export default {

  data() {
    return {
      // 左侧数据
      menulist: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },

      isCollapse: false,
      activePath: ''
    }
  },

  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },

  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },

    async getMenuList() {
      const {
        data: res
      } = await this.$http.get('menus')

      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)

      this.menulist = res.data
    },

    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },

    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
    height: 100%;
}

.el-header {
    background-color: #373D41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;

    >div {
        display: flex;
        align-items: center;

        img {
            height: 40px;
            width: 40px;
        }

        span {
            margin-left: 15px;
        }
    }
}

.el-aside {
    background-color: #333744;

    .el-menu {
        border: none;
    }
}

.el-main {
    background-color: #eaedf1;

}

.iconfont {
    margin-right: 10px;
}

.toggle-button {
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>
